Troffer light fixture

Abstract

A light fixture with a troffer design. One light fixture includes light guide plates that extend above a back pan of the housing. LED assemblies are connected to light guide plates and direct light into the light guide plates through one of the outer edges. Each of the light guide plates receive the light through the outer edge and directs the light outward from the outer surface. Another light fixture includes a back pan, first and second light panels that are positioned above and spaced away from the back pan. Pixels are mounted on the outer surface of the light panels with each of the pixels configured to emit light.

What is claimed is: 
     
       1. A light fixture comprising:
 a back pan; 
 light guide assembly spaced away from and positioned over the back pan, the light guide assembly comprising first and second light guide plates that each include outer edges, an outer face that faces away from the back pan, and an inner face that faces towards the back pan, the first and second light guide plates connected together along the outer edges; and 
 a first LED assembly that extends along one of the outer edges of the first light guide plate and a second LED assembly that extends along one of the outer edges of the second light guide plate, each of the first and second LED assemblies comprising LED elements that are aligned in an elongated array to emit light into the respective first and second light guide plates; 
 each of the first and second light guide plates configured to receive the light through the outer edge and to direct the light outward from the outer surface and away from the back pan. 
 
     
     
       2. The light fixture of  claim 1 , wherein the inner faces of the first and second light guide plates each comprise an array of dips having an elongated shape with a major axis that is perpendicular to the respective first and second LED assemblies and a minor axis that is parallel with the respective first and second LED assembly. 
     
     
       3. The light fixture of  claim 2 , wherein each of the inner faces further comprise a planar surface with the dips extending into the planar surface. 
     
     
       4. The light fixture of  claim 2 , wherein the outer faces of the first and second light guide plates each comprise elongated features that extend a length and are perpendicular to the respective first and second LED assemblies. 
     
     
       5. The light fixture of  claim 4 , wherein the elongated features comprise ridges that each has a semi-spherical shape. 
     
     
       6. The light fixture of  claim 1 , wherein the inner faces of the first and second light guide plates each comprise first features that cause diffuse reflection of the light and second features that cause specular reflection of the light. 
     
     
       7. The light fixture of  claim 1 , wherein the LED assemblies are attached to first ones of the outer edges of the respective first and second light guide plates, and opposing second outer edges of the respective first and second light guide plates each comprise a reflector that reflects at least a portion of the light. 
     
     
       8. The light fixture of  claim 1 , wherein the inner faces of the first and second light guide plates are configured for total internal reflection of the light. 
     
     
       9. The light fixture of  claim 1 , further comprising a connector that connects together the first and second light guide plates, the connector comprising a body with slots that receives the outer edges of the first and second light guide plates, and with the connector positioned along a center line of the back pan. 
     
     
       10. The light fixture of  claim 1 , further comprising a diffuser film positioned on the outer faces of the first and second light guide plates and a diffuse reflector positioned on the inner faces of the first and second light guide plates. 
     
     
       11. The light fixture of  claim 1 , wherein the light fixture comprises a symmetrical shape about a center line of the light fixture. 
     
     
       12. A light fixture comprising:
 a concave back pan; 
 first and second light guide plates that each include inner sides that are connected together and opposing outer sides that contact against opposing sections of the back pan, the first and second light guide plates further comprising an outer face that faces away from the back pan and an inner face that faces towards the back pan; 
 a first LED assembly connected to the inner side of the first light guide plate and configured to direct light into the first light guide plate through the inner side; and 
 a second LED assembly connected to the inner side of the second light guide plate and configured to direct light into the second light guide plate through the inner side; 
 each of the first and second light guide plates configured to receive the light through the inner side and to direct the light outward from the outer face. 
 
     
     
       13. The light fixture of  claim 12 , wherein each of the first and second LED assemblies comprises LED elements that are aligned in an elongated array that extends a length of the inner side of the respective first and second light guide plates. 
     
     
       14. The light fixture of  claim 12 , wherein the inner face of each of the first and second light guide plates is configured for total internal reflection of the light. 
     
     
       15. The light fixture of  claim 12 , wherein the inner face of each of the first and second light guide plates comprises a planar face with an array of dips that extend into the planar face. 
     
     
       16. The light fixture of  claim 15 , wherein each of the dips comprises an elongated shape with a major axis that is perpendicular to the respective first and second LED assemblies. 
     
     
       17. The light fixture of  claim 12 , wherein each of the outer sides of the first and second light guide plates comprises a reflector that reflects at least a portion of the light back into the respective light guide plate. 
     
     
       18. The light fixture of  claim 12 , further comprising a connector that connects together the inner sides of each of the first and second light guide plates and wherein the connector further supports the first and second LED assemblies. 
     
     
       19. The light fixture of  claim 12 , further comprising a reflector positioned on the inner faces of the first and second light guide plates. 
     
     
       20. The light fixture of  claim 19 , further comprising a diffuser positioned on the outer faces of the first and second light guide plates. 
     
     
       21. A light fixture comprising:
 a housing comprising a concave back pan; 
 first and second light panels that are connected together along outer edges and are positioned above and spaced away from the back pan, the first and second light panels further comprising an outer face that faces away from the back pan and an inner face that faces towards the back pan; and 
 pixels that extend across the outer faces of each of the first and second light panels with each of the pixels configured to emit light. 
 
     
     
       22. The light fixture of  claim 21 , wherein each of the pixels comprises three sub-pixels that include a red sub-pixel, a blue sub-pixel, and a green sub-pixel. 
     
     
       23. The light fixture of  claim 21 , wherein each of the pixels comprises a single pixel that provides uniform lighting with single white color.